检查心脏病征兆的简单方法美国研究人员用一套无痛检验法来查明一个人是否有患心脏病或者中风的危险。他们使用的两种检验方法都很简单，而且比现在用的同类方法花钱要少。一种方法是用高频声波，测量颈部通向大脑每一动脉的血流速度，当部分动脉阻塞时，血流速度就会比较... A Simple Way to Check for Heart Disease Signs American researchers use a painless test to find out if a person is at risk of heart disease or stroke. The two test methods they use are simple and cost less than similar methods used today. One way is to use a high-frequency sound wave to measure the velocity of the blood flowing from the neck to each artery of the brain. When some of the arteries are blocked, the blood flow velocity will be compared ...